Re: [Boost-users] [thread] Getting this warning message with optimization turn on

Subject: Re: [Boost-users] [thread] Getting this warning message with optimization turn on
From: mike marchywka (marchywka_at_[hidden])
Date: 2010-01-04 08:30:37

On 1/4/10, Anthony Williams <anthony.ajw_at_[hidden]> wrote:
> Shiou Ming Lee <shiouming.lee_at_[hidden]> writes:
>
>> Hi, I'm building my program that depends on Boost.thread, but getting
>> following
>> warning message, only when compiler's optimization been turn on.
>>
>>     C:/boost_1_41_0/boost/thread/win32/thread_heap_alloc.hpp: In member
>> function `bool gUtil::GLog::LogWriterManager::startAsyncLogging(unsigned
>> int)':
>>     C:/boost_1_41_0/boost/thread/win32/thread_heap_alloc.hpp:156: warning:
>> 'heap_memory' might be used uninitialized in this function
>
> This is a really bizarre message. Line 156 is the declaration and
> initialization of heap_memory. How it could then be used uninitialized
> is beyond me.
>
>> This happens for MinGW 3.4 on Windows Vista SP1 32-bits, but not for GCC
>> 4.4 on
>> Fedora 11 x86. The Boost release is of version 1.41.0.
>
> It's win32-specific code, so isn't used on Fedora.
>
>> Any idea what should I do for this warning message? Or should I just leave
>> optimization on and ignore this message?
>

I've seen spurious optimization related messages in two scenarioes.
Some compilers only notice
when optimization is turned on and it is worthwhile to investigate.
Other times they optimize away
some code and then complain that it is missing. Is the latter possible?

> I would leave optimization on and ignore the message.
>
> Anthony
> --
> Author of C++ Concurrency in Action     http://www.stdthread.co.uk/book/
> just::thread C++0x thread library             http://www.stdthread.co.uk
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>
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